The CW hit show iZombie has always been a bit of a rare bird: a zombie show that goes more for laughs than gore and leans into social issues, politics and relationships more than horror. After 4 successful seasons, the final stanza is upon on, with a major upheaval in the cast dynamic in store. Ravi, Liv Moore’s best bud and resident zombie scientist is still grappling with a cure, while his on again, off again, and now on again girlfriend Peyton is the acting Mayor of zombie-town New Seattle. She is in a pitch battle to keep …